I messed around with a BK9 quite a bit when there was one in a local store. The one I tested didn't have the latest OS updates, but I found the style editing and creation workflow to be kind of bug-ridden. This feature is important to me, so I kept my E-50. You might be able to find an E-series secondhand on an auction site. Or you could step up to an E-A7 and hope Roland did a better job with software quality control this time around.